N-α –Fmoc-N-β-1-(4,4-dimethyl-2,6-dioxocyclohe

for the following products Fmoc-(N-beta-1-(4,4-dimethyl-2,6-dioxocyclohex-1-ylidene)ethyl)-L-alpha,beta-diaminopropionic acid | Fmoc-Dap(Dde)-OH | Fmoc-L-Dap(Dde)-OH | N-alpha-(9-Fluorenylmethyloxycarbonyl)-N-beta-[(4,4-dimethyl-2,6-dioxocyclohex-1-ylidene)ethyl]-2,3-diaminopropionic acid and N-α –Fmoc-N-β-1-(4,4-dimethyl-2,6-dioxocyclohe